Tibet magnitude 7.1 earthquake (9:05 AM, 7 January 2025) 1

This is a seismogram from the Lhasa seismic station in Tibet, China. The noise was caused by a magnitude 7.1 earthquake that hit the Himalayan Mountains of southern Tibet. The quake occurred at 9:05 AM, local time, on 7 January 2025. The epicenter was about 89 kilometers north-northeast of Mt. Everest. The hypocenter was between 5 and 10 kilometers deep (below sea level). Shaking resulted from normal faulting along a north-south striking fault zone. This is the first magnitude 7+ earthquake of 2025.

The Himalayas formed by tectonic collision during the late Tertiary, when the Indian Subcontinent collided with the southern margin of Asia. Plate movement before the collision was rapid - about 18 centimeters per year.
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Info. at:
earthquake.usgs.gov/earthquakes/eventpage/us6000pi9w/exec...
[An event-specific summary is at the end of that webpage.]
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An earthquake is a natural shaking or vibrating of the Earth caused by sudden fault movement and a rapid release of energy. Earthquake activity is called "seismicity". The study of earthquakes is called "seismology". The actual underground location of an earthquake is the hypocenter, or focus. The site at the Earth's surface, directly above the hypocenter, is the epicenter. Minor earthquakes may occur before a major event - such small quakes are called foreshocks. Minor to major quakes after a major event are aftershocks.

Most earthquakes occur at or near tectonic plate boundaries, such as subduction zones, mid-ocean ridges, collision zones, and transform plate boundaries. They also occur at hotspots - large subsurface mantle plumes (Examples: Hawaii, Yellowstone, Iceland, Afar).

Earthquakes generate four types of shock waves: P-waves, S-waves, Love waves, and Rayleigh waves. P-waves and S-waves are body waves - they travel through solid rocks. Love waves and Rayleigh waves travel only at the surface - they are surface waves. P-waves are push-pull waves that travel quickly and cause little damage. S-waves are up-and-down waves (like flicking a rope) that travel slowly and cause significant damage. Love waves are side-to-side surface waves, like a slithering snake. Rayleigh waves are rotational surface waves, somewhat like ripples from tossing a pebble into a pond.

Earthquakes are associated with many specific hazards, such as ground shaking, ground rupturing, subsidence (sinking), uplift (rising), tsunamis, landslides, fires, and liquefaction.

Some famous major earthquakes in history include: Shensi, China in 1556; Lisbon, Portugal in 1755; New Madrid, Missouri in 1811-1812; San Francisco, California in 1906; Anchorage, Alaska in 1964; and Loma Prieta, California in 1989.

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Taken on: January 7, 2025

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Tibet

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earthquake

January

2025

China

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Mountains

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Sets appears in: • 2025 Earthquakes • Himalayan Earthquakes more » • Magnitude 7+ Earthquakes • Earthquakes « less

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